Find great deals on eBay for RCA 6SL7 in Vintage Tubes and Tubes Sockets. Shop with confidence. Page 1. Page 2. Page 3. Page 4. $ or over (2). Production Status. New Old Stock (6); New Production (3). Type. Vacuum Tubes (9). 6SL7. JJ 6SL7 Preamp Vacuum Tube. $ JJ-6SL7 .

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JJ Electronic – 6SL7

Good supply of all versions on hand right now, but later??? Return to the Audiophile tube page.

Tubes will be pulled at random. Both sound and 6xl7 identically. Early version ‘s and early 50’s. Later versions made during the 50’s and 60’s have clear glass with the getter down toward the bottom of the tube. This is the early version of this tube, from the s, some with an internal RF shield sprayed on the inside of the glass.

I installed the new tubes and biased the amps on Sunday. These have a nice low loss micanol base. They may or may not have listings such as “WGT”, which is mil spec ruggedized; or VT, which is the military type number of this tube.


There is still a good population of hi-fi and musical instrument amps using this tube in the preamp stage out there, and these tubes are still available. Black bases, medium glass envelope, with good labels.

Short glass envelopes, rare large ribbed greyplates. Beautiful photography and excellent information as usual. The tube has a rectangular base getter, with black oval plates. Come ‘n get ’em. Minimum good value on a TV7 tester for a tube is The brownbase have short oval plates.

Approx Qty In Stock. Date Code – matched at LR.

6SL7 / VT / – Tubes for Amps

Other brands sold a with brown or black bases, but virtually all were made by RCA. Later production units had the same plate structure but 6al7 getter was moved up to the top.

I also use a Tektronix curve tracer for testing triodes. New Old Stock original Box.

Not very many of 6al7 on hand. Tim C May 26, at 8: Whenever you see the bright plates, even in tall 6al7 glass with bottom getters they were most likely made by GE. These usually have gray plates. Earlier versions made in the 50’s, 60’s had brown bases and nice thick mica wafers for extra support and superior microphonic elimination.


Famous Sylvania “chrome domes”, long since out of production, heavy demand is making these scarce. This tube has much higher mu than it’s cousin, the 6SN7. Good supply on hand today.

They usually have black plates although later production units have gray plates. For most uses, Gm matching is fine. This runs the tube at full rated plate voltage, and plots the curves at 10 different grid bias levels.

Pretty nice selection on hand today, but they are disappearing fast!